/usr/lib/x86_64-linux-gnu/pkgconfig/libcanberra-gtk3.pc is in libcanberra-gtk3-dev 0.30-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libcanberra-gtk3
Description: Gtk3 Event Sound API
Version: 0.30
Libs: -L${libdir} -lcanberra-gtk3 -lX11
Cflags: -D_REENTRANT -I${includedir}
Requires: libcanberra gdk-3.0 gtk+-3.0
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